The Los Angeles County 2022 Building Code and its 2023 amendments have introduced significant changes to ADU (Accessory Dwelling Unit) regulations, particularly relevant to post-wildfire reconstruction. The code adopts key portions of the 2022 California Building Standards Code and includes specific provisions for construction in Wildland-Urban Interface (WUI) Fire Areas, requiring specialized building materials and systems for exterior design of new buildings and additions.

Key changes in the 2023 amendments focus on streamlining ADU development through several measures: a new 60-day response requirement for plan reviews, revised height restrictions (allowing 16-25 feet depending on location and circumstances), and relaxed setback requirements for ADUs under 800 square feet. The amendments also eliminated certain restrictions related to non-conforming conditions and removed fire sprinkler requirements for main houses during ADU construction. Impact fees have been waived for ADUs under 750 square feet, and owner occupancy is no longer mandatory.

The code allows different types of ADUs with varying specifications. Attached ADUs can be conversions within existing single-family residences, while detached ADUs can be either new construction or conversions of existing structures. Junior ADUs (JADUs) up to 500 square feet are permitted within single-family homes, and movable tiny houses between 150-430 square feet are also allowed with proper licensing. These changes collectively aim to increase housing availability and flexibility, particularly crucial for communities recovering from wildfire damage.

For post-wildfire reconstruction specifically, the code's provisions for WUI areas and the Express Permit Program's streamlined review process are especially relevant, making it easier for affected homeowners to rebuild or add ADUs as part of their recovery process.​​​​​​​​​​​​​​​​

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